CN110548965B - Control circuit and method of inverter type multifunctional direct current arc welding machine - Google Patents
Control circuit and method of inverter type multifunctional direct current arc welding machine Download PDFInfo
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- CN110548965B CN110548965B CN201910858913.XA CN201910858913A CN110548965B CN 110548965 B CN110548965 B CN 110548965B CN 201910858913 A CN201910858913 A CN 201910858913A CN 110548965 B CN110548965 B CN 110548965B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention discloses a control circuit and a method of an inverter type multifunctional direct current arc welding machine, which comprises a rectifying circuit, an inverter circuit, a first output circuit, a second output circuit, a main control circuit and a switch switching circuit, wherein the rectifying circuit converts power frequency alternating current into direct current, the inverter circuit converts the direct current into high-frequency alternating current with controllable frequency and outputs the high-frequency alternating current to one of the output circuits, and the main control circuit and the switch switching circuit only enable one output circuit to be connected with the inverter circuit at a certain moment according to a control signal sent by the main control circuit, and when output exists, the switching between the output circuits is not allowed. According to the multifunctional switching device, the primary side coils of the main transformer are arranged, each primary side coil corresponds to one corresponding secondary side coil to output, multifunctional switching is performed at the primary side, switching at a small current end is achieved, stability is improved, meanwhile, the switch switching circuit achieves contactless switching, potential safety hazards are reduced, and reliability of the whole machine is improved.
Description
Technical Field
The invention relates to the technical field of electric welding machine electric arc welding and air plasma cutting, in particular to a control circuit and a control method of an inverter type multifunctional direct current arc welding machine.
Background
At present, the power supplies of the inverter direct current manual welding power supply, the direct current argon arc welding power supply and the inverter plasma cutting machine which are known to be popular and stable in China can only realize a single welding function or a cutting function.
In some multifunctional arc welding machines capable of welding and cutting in the market, the main principle is that a relay is adopted to cut the turn ratio of a secondary winding of a main transformer to realize multifunctional switching; the secondary winding of the main transformer is a power device for bearing large current and high voltage, and the large current and high voltage are switched by using a relay, so the control method is not ideal in principle; when the relay is used for switching, the switching condition is not limited, and potential safety hazards are brought to the whole machine, for example, when the relay is switched in a load state, the relay is extremely easy to damage; the design of the multifunctional arc welding machine has defects in principle, and the control method and the defects in the control principle greatly reduce the reliability of the whole machine. The multifunctional arc welding machine has the problem of instability.
In some occasions, welding and cutting are needed, the cost performance of a single arc welding power supply is not high, and great convenience cannot be brought to users.
Therefore, the design of a safe and stable multifunctional arc welding machine meets the market demand, and is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a control circuit and a control method of an inverter type multifunctional direct current arc welding machine, which realize multifunctional output by switching at the primary stage of a main transformer and improve the stability of the inverter type multifunctional direct current arc welding machine; under the state of no output current, the output mode can be selected, and the control port is switched; and the output mode is locked by detecting the output current, namely, when the current is output, the switching control port is locked, so that the potential safety hazard is prevented.
The above object of the present invention is achieved by the following technical solutions:
a control circuit of an inverter type multifunctional direct current arc welding machine comprises a first rectification circuit, an inverter circuit, a first output circuit, a second output circuit, a main control circuit and a switch switching circuit, wherein the output of the first rectification circuit is connected with the input of the inverter circuit, the first output end of the inverter circuit is simultaneously connected with the first input ends of the first output circuit and the second output circuit, and the second output end of the inverter circuit is connected with the input end of the switch switching circuit; two output ends of the switch switching circuit are respectively connected with second input ends of the first output circuit and the second output circuit; the main control circuit is connected with the inverter circuit and is used for controlling the frequency of the inverter circuit; the main control circuit is also connected with the switch switching circuit and is used for controlling the state of the switch switching circuit so as to lead the output of the inverter circuit to be communicated with the first output circuit or the second output circuit, and the first output circuit and the second output circuit are used for controlling two output states of the direct current arc welding machine.
The invention is further configured to: the first output circuit comprises a first transformer and a second rectification output circuit; the second output circuit comprises a second transformer and a third rectification output circuit; a first output end of the inverter circuit is simultaneously connected with a first input end of the first transformer and a first input end of the second transformer; two output ends of the switch switching circuit are respectively connected with the second input end of the first transformer and the second input end of the second transformer.
The invention is further configured to: the power detection circuit is used for detecting the voltage of the power source, the input end of the power detection circuit is connected with the second output end of the inverter circuit, the output end of the power detection circuit is simultaneously connected with the first input end of the first transformer and the first input end of the second transformer, and the power detection circuit is used for detecting the voltage of the power source.
The invention is further configured to: the output current sampling circuit is connected with the output ends of the first output circuit and the second output circuit, the output end of the output current sampling circuit is connected with one input end of the main control circuit, the output current sampling circuit is used for detecting the output currents of the first output circuit and the second output circuit, and meanwhile, the sampling result is transmitted to the main control circuit.
The invention is further configured to: the output end of the input circuit is connected with the input end of the main control circuit and used for inputting parameters, and the main control circuit outputs control signals according to the input parameters and controls the working state of the switch switching circuit.
The invention is further configured to: the output end of the input circuit is connected with the input end of the main control circuit and used for inputting parameters, and the main control circuit outputs control signals according to the input parameters and the sampling results of the output current sampling circuit and controls the working state of the switch switching circuit.
The invention is further configured to: the number of the output circuits is more than two, the input end of each output circuit is respectively connected with the inverter circuit through the switch switching circuit, the main control circuit controls the switch switching circuit, and at a certain moment, the output of the inverter circuit is only electrically connected with one of the output circuits.
The invention is further configured to: the temperature detection circuit is connected with the main control circuit and used for detecting the temperatures of the inverter circuit, the first output circuit and the second output circuit and transmitting a detection result to the main control circuit.
The invention is further configured to: the switch switching circuit comprises a controllable switch and is used for switching on or off the connection between the inverter circuit and the output circuit according to a control signal of the main control circuit.
The above object of the present invention is achieved by the following technical solutions:
a control method of an inverter type multifunctional direct current arc welding machine is characterized in that a direct current power supply rectified by power frequency is converted into high-frequency alternating current after frequency conversion, the output function after frequency conversion is controlled, and at a certain moment, the output of the high-frequency alternating current is only connected with the input end of one functional output circuit in the multifunctional output circuit, so that the output of a direct current arc welding function is completed; and meanwhile, the output current of the output circuit is detected, and the multifunctional output circuit can be switched only when the output circuit has no current. The main inverter power supply is connected with N auxiliary inverter power supply main transformers connected in parallel, the N auxiliary inverter power supply main transformers connected in parallel are respectively connected with N change-over switches in series, the electronic change-over switches are respectively used for carrying out switching control on primary windings of the N auxiliary inverter power supply main transformers, and each group of auxiliary inverter power supply main power supplies correspond to one corresponding rectification filtering output.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the main inverter power supply is connected with N auxiliary inverter power supply main transformers and N change-over switches in parallel, and each group of auxiliary inverter power supply main power supplies correspond to one corresponding rectification filter output; respectively carrying out switching control on primary windings of the main transformer of the auxiliary inverter power supply by using electronic switching switches; the switching at the small current end is realized, and the stability is improved;
2. furthermore, the control switch is used for switching, so that non-contact switching is realized, the switching efficiency is improved, and the product safety is ensured;
3. furthermore, the switching condition is limited by detecting the output current, so that the potential safety hazard is reduced, and the reliability of the whole machine is improved.
Drawings
FIG. 1 is a schematic block diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Detailed description of the invention
The invention discloses a control circuit of an inverter type multifunctional direct current arc welding machine, which comprises a rectifying circuit, an inverter circuit, a first output circuit, a second output circuit, a main control circuit and a switch switching circuit, wherein the first output circuit comprises a first transformer, the second output circuit comprises a second transformer, the rectifying circuit is used for converting power frequency alternating current into direct current and then transmitting the direct current to the input end of the inverter circuit, the inverter circuit converts the direct current into high-frequency alternating current, the high-frequency alternating current is connected to original side coils of the two transformers through the switch switching circuit, the main control circuit controls the frequency of the inverter circuit and the state of the switch switching circuit, and the two transformers are respectively a cutting machine output circuit transformer and a manual welding or argon arc welding output circuit transformer.
For a simple starting point, in this specification, the output circuit of the cutting machine is referred to as a first output circuit, the transformer of the output circuit of the cutting machine is referred to as a first transformer, the output circuit of the manual welding or argon arc welding is referred to as a second output circuit, and the transformer of the output circuit of the manual welding or argon arc welding is referred to as a second transformer.
The first output circuit further comprises a first rectifying and filtering circuit, a secondary coil of the first transformer is connected with the input of the first rectifying and filtering circuit, and the output of the first rectifying and filtering circuit is used for driving the cutting machine to act.
The second output circuit also comprises a second rectifying and filtering circuit, a secondary coil of the second transformer is connected with the input of the second rectifying and filtering circuit, and the output of the second rectifying and filtering circuit is used for driving manual welding or argon arc welding.
The output ends of the first output circuit and the second output circuit are connected in parallel and led out from the same output end.
The main control circuit is connected with the control end of the inverter circuit through the driving module, and the driving module controls the power tube of the inverter circuit to be turned on or turned off according to the control signal output by the main control circuit, so that the frequency of the inverter circuit is controlled. The frequency of the inverter circuit is different for different output modes and output powers.
The inverter circuit changes the output power by changing the frequency, thereby saving energy.
The input end of the switch switching circuit is connected with one output end of the inverter circuit, the two output ends of the switch switching circuit are respectively connected with the non-in-phase ends of the first transformer and the second transformer, the control end of the switch switching circuit is connected with the main control circuit, and the main control circuit outputs a switch control signal to control the switch switching circuit, so that the output of the inverter circuit is connected with the first transformer or the second transformer.
The other output end of the inverter circuit is connected with the in-phase end of the first transformer and the in-phase end of the second transformer.
In a specific embodiment of the present application, a power detection circuit is further connected between the other output terminal of the inverter circuit and the non-inverting terminal of the first transformer and the non-inverting terminal of the second transformer, and is configured to detect output powers of the first output circuit and the second output circuit, and when the output power is greater than a set value, the main control circuit outputs a control signal to change an output frequency of the inverter circuit or disconnect the output circuit.
In a specific embodiment of the present application, the power detection circuit includes a transformer for detecting the magnitude of the output power.
In one embodiment of the present application, the switching circuit includes a controllable switch, such as at least one of a thyristor, and a power tube, for controlling which output circuit is connected to the output of the inverter circuit according to the control signal.
The control circuit of the inverter type multifunctional direct current arc welding machine further comprises an output current sampling circuit, wherein the output current sampling circuit is connected with the output ends of the first output circuit and the second output circuit, the output end of the output current sampling circuit is connected with one input end of the main control circuit, and the output current sampling circuit is used for detecting the output currents of the first output circuit and the second output circuit and transmitting a sampling result to the main control circuit. The main control circuit controls the output according to the output current sampling signal.
When no current is output from the output end, the main control circuit controls the switching of the output mode to switch the first output circuit and the second output circuit;
when the current output exists at the output end, the output mode in the current state is locked, the mode switching is prevented when the current output exists, and the reliability of the power control device is improved.
In a specific embodiment of the present application, the output current sampling circuit includes a hall sensor for detecting the output current.
The control circuit of the inverter type multifunctional direct current arc welding machine further comprises an input circuit, wherein the output end of the input circuit is connected with the input end of the main control circuit and used for inputting parameters, and the main control circuit outputs control signals according to the input parameters and controls the working state of the switch switching circuit.
In a particular embodiment of the application, the input circuit comprises a human-machine conversation interface for inputting the parameter.
In a specific embodiment of this application, the quantity of output circuit is greater than two, and the input of every output circuit is connected with inverter circuit through switch switching circuit respectively, and main control circuit control switch switching circuit, and at a certain moment, inverter circuit's output only communicates with one of them output circuit electricity, and when an output circuit electricity communicates, can not carry out output circuit's switching, only when no output circuit communicates with inverter circuit, can carry out output circuit's switching to guarantee the reliability of output.
The control circuit of the inverter type multifunctional direct current arc welding machine further comprises a temperature detection circuit which is connected with the main control circuit and used for detecting the temperature of at least one of the inverter circuit, the first output circuit and the second output circuit and transmitting the detection result to the main control circuit, and the main control circuit controls the states of the inverter circuit and the switch switching circuit according to the temperature detection result.
Detailed description of the invention
A control method of an inverter type multifunctional direct current arc welding machine is characterized in that power frequency alternating current is converted into first direct current, the first direct current is converted into high-frequency alternating current through frequency conversion, the frequency of the high-frequency alternating current is controlled by a main control circuit according to output states and input parameters, the high-frequency alternating current is connected with primary windings of transformers of a plurality of output circuits after passing through a switch switching circuit, and at a certain moment, the switch switching circuit only allows one output circuit to be connected with the high-frequency alternating current, namely only one output circuit is output; the output current of the output circuit is detected, when one output circuit is available, the switch switching circuit is not allowed to switch the output circuit, when all the output circuits have no output, the switch switching circuit is allowed to switch, and the output circuit is selected to output.
In an embodiment of the present application, a main inverter power source is connected to N parallel-connected main transformers of secondary inverter power sources, the N parallel-connected main transformers of secondary inverter power sources are respectively connected in series with N switches, the electronic switches are respectively used to switch and control primary windings of the N main transformers of secondary inverter power sources, and each group of main power sources of secondary inverter power sources corresponds to a corresponding rectification filter output.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A control circuit of an inverter type multifunctional direct current arc welding machine is characterized in that: the power supply comprises a first rectification circuit, an inverter circuit, a first output circuit, a second output circuit, a main control circuit, a switch switching circuit and an output current sampling circuit, wherein the output of the first rectification circuit is connected with the input of the inverter circuit, the first output end of the inverter circuit is simultaneously connected with the first input ends of the first output circuit and the second output circuit, and the second output end of the inverter circuit is connected with the input end of the switch switching circuit; two output ends of the switch switching circuit are respectively connected with second input ends of the first output circuit and the second output circuit; the main control circuit is connected with the inverter circuit and is used for controlling the frequency of the inverter circuit; the main control circuit is also connected with a switch switching circuit and is used for controlling the state of the switch switching circuit so as to lead the output of the inverter circuit to be communicated with either the first output circuit or the second output circuit, and the first output circuit and the second output circuit are used for controlling two output states of the direct current arc welding machine; the output current sampling circuit is connected with the output ends of the first output circuit and the second output circuit, the output end of the output current sampling circuit is connected with one input end of the main control circuit, and the output current sampling circuit is used for detecting the output currents of the first output circuit and the second output circuit and transmitting the sampling result to the main control circuit; the main control circuit controls output according to the output current sampling signal, when the output end has no current output, the main control circuit controls the switching of the output mode, the switching of the first output circuit and the second output circuit is carried out, when the output end has current output, the output mode in the current state is locked, and the mode switching is prevented when the output is available.
2. The control circuit of the inverter type multifunctional direct current arc welding machine according to claim 1, characterized in that: the first output circuit comprises a first transformer and a second rectification output circuit; the second output circuit comprises a second transformer and a third rectification output circuit; a first output end of the inverter circuit is simultaneously connected with a first input end of the first transformer and a first input end of the second transformer; two output ends of the switch switching circuit are respectively connected with the second input end of the first transformer and the second input end of the second transformer.
3. The control circuit of the inverter type multifunctional direct current arc welding machine according to claim 1, characterized in that: the power detection circuit is used for detecting output power.
4. The control circuit of the inverter type multifunctional direct current arc welding machine according to claim 1, characterized in that: the output end of the input circuit is connected with the input end of the main control circuit and used for inputting parameters, and the main control circuit outputs control signals according to the input parameters and controls the working state of the switch switching circuit.
5. The control circuit of the inverter type multifunctional direct current arc welding machine according to claim 1, characterized in that: the output end of the input circuit is connected with the input end of the main control circuit and used for inputting parameters, and the main control circuit outputs control signals according to the input parameters and the sampling results of the output current sampling circuit and controls the working state of the switch switching circuit.
6. The control circuit of the inverter type multifunctional direct current arc welding machine according to claim 1, characterized in that: the number of the output circuits is more than two, the input end of each output circuit is respectively connected with the inverter circuit through the switch switching circuit, the main control circuit controls the switch switching circuit, and at a certain moment, the output of the inverter circuit is only electrically connected with one of the output circuits.
7. The control circuit of the inverter type multifunctional direct current arc welding machine according to claim 1, characterized in that: the temperature detection circuit is connected with the main control circuit and used for detecting the temperatures of the inverter circuit, the first output circuit and the second output circuit and transmitting a detection result to the main control circuit.
8. The control circuit of the inverter type multifunctional direct current arc welding machine according to claim 1, characterized in that: the switch switching circuit comprises a controllable switch and is used for switching on or off the connection between the inverter circuit and the output circuit according to a control signal of the main control circuit.
9. A control method of an inverter type multifunctional direct current arc welding machine is characterized by comprising the following steps: the control circuit of the inverter type multifunctional DC arc welder according to any one of claims 1 to 8, wherein the first rectifying circuit converts the frequency of the DC power supply rectified from the power frequency AC into a high frequency AC after being converted by the inverter circuit to control the output function after being converted, the number of the output circuits is greater than or equal to two, the input end of each output circuit is respectively connected with the inverter circuit through a switch switching circuit to detect the output current of the output circuit, the main control circuit controls the switch switching circuit according to the output current sampling signal, and the output of the high frequency AC is only connected with the input end of one output circuit of the multifunctional output circuits at a certain time to complete the output of one DC arc welding function; the switching between the multi-function output circuits can be performed only when the output circuits are currentless.
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| CN201910858913.XA CN110548965B (en) | 2019-09-11 | 2019-09-11 | Control circuit and method of inverter type multifunctional direct current arc welding machine |
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| CN201910858913.XA CN110548965B (en) | 2019-09-11 | 2019-09-11 | Control circuit and method of inverter type multifunctional direct current arc welding machine |
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| CN111992847B (en) * | 2020-08-27 | 2024-05-31 | 上海沪工焊接集团股份有限公司 | Control method and device for wide-voltage multifunctional arc welder and storage medium thereof |
| CN112496500A (en) * | 2020-12-17 | 2021-03-16 | 上海广为焊接设备有限公司 | Control system and method based on multifunctional electric welding machine |
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